The help text for the accessibility element.
- macOS 10.10+
Use this property only when the results of activating this element are not obvious from the element’s label. This string functions as a tooltip. For example, VoiceOver reads this string when you pause over a control. To help ensure that accessibility clients like VoiceOver read the help text with the proper inflection, begin this string with a verb, capitalize the first letter, and end the string with a period. Always localize this string. The default value is